Aortic Bioprosthesis Anchoring Structure for Accurate Valve Placement
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Solution Overview
Problem
Conventional cardiac valve replacement procedures require large incisions and cardiopulmonary bypass, and percutaneous methods face challenges in ensuring proper valve positioning and stability, leading to issues like regurgitation and instability.
Innovation Solution
A replacement valve system with a stent component featuring conical anchoring crowns and stabilization arches for secure positioning, allowing transapical delivery and expansion, and a delivery system with a sheath for controlled deployment and recapture.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If percutaneous delivery method is used, then invasiveness is reduced, but valve positioning accuracy deteriorates
Solution Approach 1:
The patent applies preliminary action by providing preliminary expansion of the distal portion of the stent before full deployment. This allows the distal end to be positioned and stabilized in the aorta first, ensuring accurate positioning before the proximal portion is expanded. The selective preliminary expansion mechanism enables the operator to control the timing and sequence of stent deployment, improving positioning accuracy while maintaining the benefits of percutaneous access.
2Device complexity
If percutaneous delivery method is used, then surgical complexity is reduced, but valve stability deteriorates
Solution Approach 1:
The patent applies segmentation by dividing the stent into distinct portions: a distal portion and a proximal portion, which can be expanded at different times. The stent also includes specific structural features such as anchoring elements and a conical shape that enhance stability. The segmented approach allows the distal portion to be deployed first to provide a stable foundation, while the proximal portion is expanded subsequently to complete the valve installation, ensuring both stability and ease of percutaneous delivery.
Solution Approach 2:
The patent applies dynamics through the selective expansion mechanism that allows the stent to transition from a compressed state to an expanded state in a controlled sequence. The stent includes features such as shape memory alloy components or balloon-expandable structures that enable dynamic deployment. This dynamic capability allows the valve to be delivered through a small percutaneous access and then expanded to its final stable configuration within the aorta, maintaining both surgical simplicity and valve stability.
3Manufacturing precision
If selective preliminary expansion is implemented, then positioning accuracy is improved, but device complexity increases
Solution Approach 1:
The patent applies segmentation by dividing the stent into distinct portions: a distal portion and a proximal portion, which can be expanded at different times. The stent includes specific structural features such as anchoring elements and a conical shape that enhance stability. The segmented approach allows the distal portion to be deployed first to provide a stable foundation, while the proximal portion is expanded subsequently to complete the valve installation, ensuring both stability and ease of percutaneous delivery.
Data Source
AI summary
Embodiments of the present disclosure are directed to stents, valved-stents, and associated methods and systems for their delivery via minimally-invasive surgery.